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Real-life friends Natalie Portman and Mila Kunis had the help of tequila to shoot a sex scene, the film's director has revealed.

The actresses play rival ballerinas in the upcoming drama Black Swan, with Portman having reportedly suggested Kunis for her role. But they may have got more than they bargained for when they had to shoot a graphic sex scene. In a new interview, director Darren Aronofsky said the friends felt they needed a couple of drinks to help them through the awkward scene.

A bottle of tequila was procured for the occasion, he reportedly told The Hollywood Reporter. The director, who is engaged to actress Rachel Weisz, said he had set aside a day-and-a-half to film the sequence - but felt so guilty that he did it in half a day.